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Introduce flags for reserve_bootmem()

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This patchset adds a flags variable to reserve_bootmem() and uses the
BOOTMEM_EXCLUSIVE flag in crashkernel reservation code to detect collisions
between crashkernel area and already used memory.

This patch:

Change the reserve_bootmem() function to accept a new flag BOOTMEM_EXCLUSIVE.
If that flag is set, the function returns with -EBUSY if the memory already
has been reserved in the past.  This is to avoid conflicts.

Because that code runs before SMP initialisation, there's no race condition
inside reserve_bootmem_core().

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix powerpc build]
Signed-off-by: Bernhard Walle <bwalle@suse.de>
Cc: <linux-arch@vger.kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bernhard Walle
2008-02-07 00:15:17 -08:00
committed by Linus Torvalds
parent 25fad945a7
commit 72a7fe3967
43 changed files with 183 additions and 105 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kernel/mpparse_32.c
View File

@@ -736,7 +736,8 @@ static int __init smp_scan_config (unsigned long base, unsigned long length)
smp_found_config = 1;
printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
mpf, virt_to_phys(mpf));
reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
BOOTMEM_DEFAULT);
if (mpf->mpf_physptr) {
/*
* We cannot access to MPC table to compute
@@ -751,7 +752,8 @@ static int __init smp_scan_config (unsigned long base, unsigned long length)
unsigned long end = max_low_pfn * PAGE_SIZE;
if (mpf->mpf_physptr + size > end)
size = end - mpf->mpf_physptr;
reserve_bootmem(mpf->mpf_physptr, size);
reserve_bootmem(mpf->mpf_physptr, size,
BOOTMEM_DEFAULT);
}
mpf_found = mpf;

18
arch/x86/kernel/setup_32.c
View File

@@ -390,7 +390,7 @@ static void __init reserve_ebda_region(void)
unsigned int addr;
addr = get_bios_ebda();
if (addr)
reserve_bootmem(addr, PAGE_SIZE);
reserve_bootmem(addr, PAGE_SIZE, BOOTMEM_DEFAULT);
}
#ifndef CONFIG_NEED_MULTIPLE_NODES
@@ -484,7 +484,8 @@ static void __init reserve_crashkernel(void)
(unsigned long)(total_mem >> 20));
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
reserve_bootmem(crash_base, crash_size);
reserve_bootmem(crash_base, crash_size,
BOOTMEM_DEFAULT);
} else
printk(KERN_INFO "crashkernel reservation failed - "
"you have to specify a base address\n");
@@ -525,7 +526,7 @@ static void __init reserve_initrd(void)
}
if (ramdisk_end <= end_of_lowmem) {
/* All in lowmem, easy case */
reserve_bootmem(ramdisk_image, ramdisk_size);
reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
initrd_start = ramdisk_image + PAGE_OFFSET;
initrd_end = initrd_start+ramdisk_size;
return;
@@ -536,7 +537,7 @@ static void __init reserve_initrd(void)
/* Note: this includes all the lowmem currently occupied by
the initrd, we rely on that fact to keep the data intact. */
reserve_bootmem(ramdisk_here, ramdisk_size);
reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
initrd_start = ramdisk_here + PAGE_OFFSET;
initrd_end = initrd_start + ramdisk_size;
@@ -606,13 +607,14 @@ void __init setup_bootmem_allocator(void)
* bootmem allocator with an invalid RAM area.
*/
reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
BOOTMEM_DEFAULT);
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem(0, PAGE_SIZE);
reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
/* reserve EBDA region, it's a 4K region */
reserve_ebda_region();
@@ -622,7 +624,7 @@ void __init setup_bootmem_allocator(void)
unless you have no PS/2 mouse plugged in. */
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
boot_cpu_data.x86 == 6)
reserve_bootmem(0xa0000 - 4096, 4096);
reserve_bootmem(0xa0000 - 4096, 4096, BOOTMEM_DEFAULT);
#ifdef CONFIG_SMP
/*
@@ -630,7 +632,7 @@ void __init setup_bootmem_allocator(void)
* FIXME: Don't need the extra page at 4K, but need to fix
* trampoline before removing it. (see the GDT stuff)
*/
reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
#endif
#ifdef CONFIG_ACPI_SLEEP
/*

5
arch/x86/kernel/setup_64.c
View File

@@ -189,7 +189,7 @@ contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
e820_register_active_regions(0, start_pfn, end_pfn);
free_bootmem_with_active_regions(0, end_pfn);
reserve_bootmem(bootmap, bootmap_size);
reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
}
#endif
@@ -238,7 +238,8 @@ static void __init reserve_crashkernel(void)
(unsigned long)(free_mem >> 20));
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
reserve_bootmem(crash_base, crash_size);
reserve_bootmem(crash_base, crash_size,
BOOTMEM_DEFAULT);
} else
printk(KERN_INFO "crashkernel reservation failed - "
"you have to specify a base address\n");